There are times when you will want to add a page, but may not want it to show up as a secondary menu link and would still like the page to have the sidebar features of its related category.
1. Create a page as usual and create link it to the appropriate parent menu.
2. In the admin toolbar, hover you cursor over Structure.
3. Pull your cursor down and place it over Menus.
4. Click on Main Menu.
5. Uncheck the Enabled box next to that page.
6. Click Save configuration.